US8457455B2 - Optical waveguide, optical waveguide module, and electronic apparatus - Google Patents

Optical waveguide, optical waveguide module, and electronic apparatus Download PDF

Info

Publication number
US8457455B2
US8457455B2 US12/530,793 US53079308A US8457455B2 US 8457455 B2 US8457455 B2 US 8457455B2 US 53079308 A US53079308 A US 53079308A US 8457455 B2 US8457455 B2 US 8457455B2
Authority
US
United States
Prior art keywords
light
light guide
core
guide
incident surface
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related, expires
Application number
US12/530,793
Other languages
English (en)
Other versions
US20100135613A1 (en
Inventor
Yukari Terakawa
Hayami Hosokawa
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Omron Corp
Original Assignee
Omron Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Omron Corp filed Critical Omron Corp
Assigned to OMRON CORPORATION reassignment OMRON CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: HOSOKAWA, HAYAMI, TERAKAWA, YUKARI
Publication of US20100135613A1 publication Critical patent/US20100135613A1/en
Application granted granted Critical
Publication of US8457455B2 publication Critical patent/US8457455B2/en
Expired - Fee Related legal-status Critical Current
Adjusted expiration legal-status Critical

Links

Images

Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
    • G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
    • G02B6/122—Basic optical elements, e.g. light-guiding paths
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/4201—Packages, e.g. shape, construction, internal or external details
    • G02B6/4204—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms
    • G02B6/4214—Packages, e.g. shape, construction, internal or external details the coupling comprising intermediate optical elements, e.g. lenses, holograms the intermediate optical element having redirecting reflective means, e.g. mirrors, prisms for deflecting the radiation from horizontal to down- or upward direction toward a device
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/24—Coupling light guides
    • G02B6/42—Coupling light guides with opto-electronic elements
    • G02B6/43—Arrangements comprising a plurality of opto-electronic elements and associated optical interconnections

Definitions

  • the present invention relates to a light guide for transmitting an optical signal, a light guide module, and an electronic device.
  • optical communication network enabling large capacity data communication at high speed is expanding.
  • the optical communication network is assumed to be mounted from intra-devices to inter-device in the future.
  • a light guide that can be arrayed is expected to realize the print wiring substrate as an optical wiring.
  • the light guide has a double structure of a center core, which is called a core, and a capsule, which is called a clad, that covers the core, where the index of refraction of the core is higher than the clad.
  • the optical signal entered to the core is propagated by repeating total reflection inside the core.
  • a light guide having high bendability is being developed by using a material more flexible than the related art for the material of the core and the clad of the light guide.
  • the data transmission between the substrates in the device can be carried out with the light guide by using the light guide having high bendability.
  • a drive portion drives the light emission of the light emitting portion (optical element) based on an externally input electrical signal, and the light emitting portion irradiates the light incident surface of the light guide with light.
  • the light applied to the light incident surface of the light guide is introduced into the light guide (core), propagated by repeating total reflection inside the core, and exit from the light exit surface of the light guide.
  • the light exit from the light exit surface of the light guide is received by a light receiving portion (optical element) and converted to an electrical signal.
  • the light guide module using such light guide is disclosed in Patent Document 1 to 3, and the like.
  • the conventional light guide modules use an area light emitting laser for the laser emitting portion, and the light incident surface and the light exit surface of the light guide are arranged while inclined with respect to the light transmission direction in a case where the light is transmitted in the core to miniaturize the light guide module.
  • the light from the light emitting portion is applied in the lateral direction with respect to the light transmission direction in the light guide, and the light reflected at the light incident surface is introduced into the core.
  • the light propagated through the core is reflected at the light exit surface and exit in the lateral direction with respect to the light transmission direction.
  • Patent Document 1 Japanese Laid-Open Patent Publication No. 2000-214351 (date of publication: Aug. 4, 2000)
  • Patent Document 2 Japanese Laid-Open Patent Publication No. 2000-292656 (date of publication: Oct. 20, 2000)
  • Patent Document 3 Japanese Laid-Open Patent Publication No. 2005-331535 (date of publication: Dec. 2, 2005)
  • FIG. 19 is a cross-sectional view showing a light emitting region of the light emitted from the light emitting portion to be introduced into the light guide (core).
  • ⁇ 1 and ⁇ 2 are angles showing the range the light emitted from the light emitting portion can be introduced into the core, and respectively shows the angle with respect to a light emission axis in the normal line direction at the light emitting portion.
  • the light emitted in the range of ⁇ 1 and ⁇ 2 is totally reflected at the light incident surface and introduced into the core.
  • the positional relationship of the light incident surface of the light guide and the range ( ⁇ 1 and ⁇ 2 ) of the light from the light emitting portion that can be introduced into the light guide fluctuates due to variation when mounting the light emitting portion, variation when mounting the light guide and the like, and a range where the light is not applied to the light incident surface of the light guide of the range ( ⁇ 1 and ⁇ 2 ) of the light from the light emitting portion that can be introduced into the light guide forms.
  • the light quantity of the light to be introduced into the light guide is reduced.
  • the coupling loss which is the loss of light that occurs when the light from the light emitting portion enters the light guide, increases. If the light quantity of the light introduced into the light guide reduces due to the coupling loss, the light quantity of the light received by the light receiving portion is also reduced, and thus stable light transmission becomes difficult.
  • FIGS. 20( a ) and 20 ( b ) are cross-sectional views in a case where positional shift occurs when mounting the light emitting portion and the light guide.
  • the light in the range of ⁇ 1 is not applied to the light incident surface of the core and becomes a loss
  • the light in the range of ⁇ 4 - ⁇ 2 is totally reflected at the light incident surface but exceeds the index of refraction of the light guide, thus the light cannot be propagated through the light guide and becomes a loss.
  • FIG. 20( a ) the light in the range of ⁇ 1 is not applied to the light incident surface of the core and becomes a loss
  • the light in the range of ⁇ 4 - ⁇ 2 is totally reflected at the light incident surface but exceeds the index of refraction of the light guide, thus the light cannot be propagated through the light guide and becomes a loss.
  • the light in the range of ⁇ 6 - ⁇ 2 is not applied to the light incident surface of the core and becomes a loss, and the light in the range of ⁇ 5 - ⁇ 1 is transmitted without being totally reflected as the incident angle with respect to the light incident surface exceeds a critical angle and becomes a loss.
  • the coupling loss increases and fluctuates due to variation and the like in mounting, and a stable light transmission becomes difficult. Furthermore, if the light emitting amount from the light emitting portion is increased to correct the reduction in the light receiving amount at the light receiving portion that occurs by the coupling loss, the power consumption increases. Moreover, a feedback circuit is required to perform a stable light transmission, whereby the development period extends, the IC cost increases, and the system power consumption increases.
  • FIG. 21 is a cross-sectional view of a light guide module in a case where the light emitting portion and the light guide are mounted in a package.
  • the distance is difficult to be reduced since the distance between the light guide and the light emitting portion needs to be secured as a wiring space for mounting the light emitting portion.
  • a method of absorbing variation in mounting the light guide and the light emitting portion by increasing the height (thickness) of the core that becomes the normal line direction of the light emitting portion is considered as another method of reducing the coupling loss.
  • the thickness of the core is made large, the thickness of the entire light guide module becomes large, and the loss of light due to bending of the light guide (bending loss) increases. If the bending loss increases even though the coupling loss is reduced, the loss of light cannot be reduced in the light guide module as a whole, and thus stable light transmission cannot be carried out.
  • the fluctuation of the light quantity needs to be suppressed and maintained constant not only on the light emitting portion side but also on the light receiving portion side in order to realize a stable light transmission in the light guide module.
  • the relationship of the light receiving region in the light receiving portion and the irradiation region of the light applied from the light guide to the light receiving portion is preferably the relationship shown in FIG. 22( a ) so as not to be susceptible to the influence of fluctuation of the light receiving quantity due to variation and the like when mounting the light guide and the light receiving portion.
  • the light receiving region of the light receiving portion is preferably sufficiently larger than the irradiation region applied from the light guide to the light receiving portion.
  • the light reception size of the light receiving portion itself needs to be made large to increase the light receiving region, which increases the manufacturing cost. As the light receiving region becomes larger, higher speed of the response speed becomes difficult to respond.
  • a method of reducing the irradiation region with respect to the light receiving region without increasing the light receiving region of the light receiving portion and reducing the distance between the light receiving portion and the light guide so as to obtain the relationship shown in FIG. 22( b ) is considered.
  • the wire mounted on the light receiving portion becomes an impediment, and thus the distance between the light receiving portion and the light guide cannot be reduced to the desired distance and sufficient effects cannot be obtained.
  • FIG. 22( b ) is a view showing the relationship of the light receiving region and the irradiation region in the conventional light guide module where the light receiving region of the light receiving portion and the irradiation region of the light applied from the light guide to the light receiving portion are substantially the same size.
  • the light receiving quantity at the light receiving portion fluctuates due to variation when mounting the light receiving portion and the light guide, as described above.
  • a feedback circuit and the like are required, and various problems accompanied therewith such as extension of the development period, increase in the IC cost, and increase in the system power consumption arise.
  • FIG. 22( c ) is a view showing a relationship of the light receiving region and the irradiation region in the conventional light guide module where the irradiation region of the light applied from the light guide to the light receiving portion is sufficiently larger than the light receiving region of the light receiving portion.
  • the light receiving quantity at the light receiving portion can be maintained constant as the light receiving region does not deviate from the irradiation region even if variation occurs when mounting the light receiving portion and the light guide.
  • the distance from the light guide to the light receiving portion needs to be made large to extend the irradiation region, in which case, the size of the entire light guide module enlarges and mounting to a small electronic device becomes difficult.
  • a method of increasing the height (thickness) of the core that becomes the normal line direction of the light receiving portion to extend the irradiation region is also considered, but in such case, the bending loss becomes large when using the light guide in a bent state and stable light transmission cannot be performed, as shown in FIG. 23 .
  • FIGS. 24( a ) and 24 ( b ) are views showing a relationship of the light receiving region of the light receiving portion and the irradiation region of the light applied from the light guide in the conventional light guide module.
  • increasing the width direction that becomes the longitudinal direction of the core at the cross-section orthogonal to the light transmission direction does not raise any problem in terms of space.
  • the width of the core can be made large such that the irradiation region becomes sufficiently larger than the light receiving region.
  • the light quantity received by the light receiving portion can be maintained constant since the proportion of the irradiation region with respect to the light receiving region does not change even if variation occurs when mounting the light receiving portion and the light guide.
  • measures need to be taken on the variation in the direction (direction of arrow in the figure) parallel to the light transmission direction to suppress the fluctuation of the light receiving quantity in the light receiving portion.
  • the present invention has been devised to solve the problems described above, and an object thereof is to provide a light guide, a light guide module, and an electronic device capable of suppressing the fluctuation amount of the light loss in light transmission and enabling stable light transmission with a simple configuration.
  • the present invention provides a light guide including a core made of a material having translucency and a clad made of a material having an index of refraction different from an index of refraction of the core and surrounding a periphery of the core, a light incident surface and a light exit surface, which are end faces of the core and the clad, being formed as inclined surfaces so that an orthogonal projection to a plane orthogonal to an extending direction of the light guide has a rectangular shape and being inclined at a predetermined angle in a direction of moving away from the end face, a light applied from a light source being introduced into the core by being reflected at the light incident surface and a light transmitted through the core being exit to outside by being reflected at the light exit surface; wherein at least one of the light incident surface or the light exit surface of the core is arranged while shifted in parallel without changing respective inclined angles so that the inclined surface is divided into a plurality of inclined surfaces parallel in a longitudinal direction of the rectangular shape in the orthogonal
  • the positional relationship of the light incident surface of the light guide and the range of light from the light emitting portion that can be introduced into the light guide fluctuates, whereby a range that is not applied to the light incident surface of the light guide of the range of the light from the light emitting portion that can be introduced into the light guide is generated.
  • the coupling loss i.e., loss of light that occurs when the light from the light emitting portion enters the light guide fluctuates.
  • the coupling loss i.e., loss of light that occurs when the light exit from the light guide is received by the light receiving portion fluctuates.
  • At least one of the light incident surface or the light exit surface of the core is formed in a stepwise manner in the extending direction so as to include a plurality of inclined surfaces.
  • the end face of the core is arranged while shifted in parallel without changing the respective inclined angle such that the inclined surface is divided into a plurality of inclined surfaces parallel in a longitudinal direction of a rectangular shape in the orthogonal projection and the plurality of inclined surfaces closer to the light source are positioned in a direction of moving away from the end face, whereby the end face of the core is made to a shape extending in the direction of moving away from the end face in a stepwise manner as a whole.
  • the light incident surface of the core is formed in a stepwise manner in the extending direction (direction of moving away from the end face of the light guide) so as to include a plurality of inclined surfaces, the light incident surface of the core can be made larger than the range of the light from the light emitting portion that can be introduced into the light guide.
  • the light that is outside the irradiation region in the conventional light incident surface can be reliably reflected at the light incident surface and introduced into the light guide.
  • the light quantity introduced into the light guide can be maintained constant irrespective of the fluctuation of the positional relationship of the light incident surface of the light guide and the range of the light from the light emitting portion that can be introduced into the light guide, whereby the fluctuation amount of the coupling loss, i.e., loss of light that occurs when the light from the light emitting portion enters the light guide can be suppressed. Therefore, according to the light guide, a more stable light transmission can be performed compared to the conventional configuration.
  • the irradiation region to the light receiving portion of the light exit from the light guide can be enlarged compared to the conventional configuration.
  • the light exit from the light guide can be applied even to the light receiving region where light is not applied in the conventional configuration. Therefore, the light quantity received by the light receiving portion can be maintained constant even if variation in time of mounting and the like occurs, whereby the fluctuation amount of the coupling loss, i.e., loss of light that occurs when the light exit from the light guide is received by the light receiving portion can be suppressed. Therefore, according to the light guide, a more stable light transmission can be performed compared to the conventional configuration.
  • the fluctuation amount of the loss of light in light transmission can be suppressed and a stable light transmission can be realized with a simple configuration of forming the light incident (exit) surface in a stepwise manner in the extending direction of the light guide so as to include a plurality of inclined surfaces without the complex configuration such as adding a feedback circuit and the like to compensate for the loss of light as in the related art.
  • enlargement of the light guide module can be suppressed since the fluctuation amount of the coupling loss can be suppressed without increasing the height (thickness) of the core in the normal line direction of the light emitting portion or without increasing the distance between the light guide and the light receiving portion.
  • At least one of the light incident surface or the light exit surface of the core is formed so that a distance between adjacent lines differs from each other at a plurality of lines representing a sectionalizing portion of the inclined surface shown in a plane when projected to the plane orthogonal to the extending direction of the light guide.
  • At least one of the light incident surface of the light exit surface of the core is formed such that when the light incident surface or the light exit surface of the core is seen in the extending direction of the light guide, the distance between adjacent lines differs from each other at a plurality of lines representing the sectionalizing portion of the inclined surface.
  • the reflection surface of the light can be irregularly formed, and the interference of light can be suppressed.
  • a more stable light transmission can be carried out.
  • At least one of the light incident surface or the light exit surface of the core formed in a stepwise manner in the direction of moving away from the end face so as to include a plurality of inclined surfaces includes a reflection plate for reflecting the light applied from the light source.
  • the reflection plate is configured by a thin film of a material having high reflectivity such as aluminum, or a wavelength filter for transmitting a specific wavelength.
  • a light guide module includes: the light guide; a light emitting portion for irradiating a light incident surface of the light guide with light; a light receiving portion for receiving light exit from a light exit surface of the light guide; a light emission driving portion for driving light emission of the light emitting portion based on an externally input electrical signal; and an amplifier for amplifying the electrical signal output from the light receiving portion and outputting the amplified electric signal to outside.
  • a light guide module capable of reducing the loss of light in light transmission and enabling stable light transmission with a simple configuration can be provided.
  • the light emitting portion irradiates the light guide with light from a lateral direction in an extending direction of the light guide; and the light guide introduces the light applied from the light emitting portion into the core by reflecting at the light incident surface.
  • the light receiving portion receives light from the lateral direction in the extending direction of the light guide from the light guide; and the light guide exits the light transmitted through the light guide with respect to the light receiving portion by reflecting at the light exit surface.
  • the light emitting portion and the light receiving portion are arranged in the lateral direction in the extending direction of the light guide with respect to the light guide.
  • the light emitting portion and the light receiving portion are installed between the light guide and the substrate surface to emit or receive the light in the normal line direction of the substrate surface.
  • Such configuration facilitates mounting than the configuration in which the light emitting portion and the light receiving portion are installed so as to emit and receive light parallel to the substrate surface, and can be more miniaturized.
  • FIG. 1 shows a cross-sectional view and a front view of a light guide in one embodiment of the present invention.
  • FIG. 2 is a view showing a schematic configuration of a light guide module according to the present embodiment.
  • FIG. 3 is a view schematically showing a state of light transmission in the light guide.
  • FIG. 6 is a cross-sectional view showing a light emitting region of the light emitted from a light emitting portion introduced into a core.
  • FIG. 7 is a cross-sectional view showing an irradiation region of the light exit from the light guide to the light receiving portion.
  • FIG. 8 shows a cross-sectional view and a front view of a light guide serving as a variant.
  • FIG. 9 is a cross-sectional view and a front view in a case where a protective film is arranged on the light guide serving as the variant shown in FIG. 8 .
  • FIG. 11 is a cross-sectional view and a front view of a light guide serving as another variant.
  • FIG. 12 is a cross-sectional view of a light guide serving as another variant.
  • FIG. 13 is a cross-sectional view of a light guide serving as another variant.
  • FIG. 14 is a cross-sectional view and a front view of a light guide serving as another variant.
  • FIG. 15 is a cross-sectional view and a front view of a light guide serving as another variant.
  • FIG. 16( a ) is a perspective view showing an outer appearance of a foldable portable telephone including the light guide according to the present embodiment
  • ( b ) is a block diagram of a portion where the light guide is applied in the foldable portable telephone shown in ( a )
  • ( c ) is a perspective plan view of a hinge portion in the foldable portable telephone shown in ( a ).
  • FIG. 17( a ) is a perspective view showing an outer appearance of a printing device including the light guide according to the present embodiment
  • ( b ) is a block diagram showing the main parts of the printing device shown in 17 ( a )
  • ( c ) and ( d ) are perspective views showing a curved state of the light guide when the printer head is moved (driven) in the printing device;
  • FIG. 18 is a perspective view showing an outer appearance of a hard disc recording and reproducing device including the light guide according to the present embodiment.
  • FIG. 19 is a cross-sectional view showing a light emitting region of the light emitted from a light emitting portion to be introduced into a light guide in the conventional light guide.
  • FIGS. 20( a ) and 20 ( b ) are cross-sectional views in a case where positional shift occurs when mounting the light emitting portion and the light guide in the conventional light guide.
  • FIG. 21 is a cross-sectional view of a light guide module in a case where the light emitting portion and the light guide are mounted in a package in the conventional light guide.
  • FIGS. 22( a ) to (C) are top views showing a positional relationship of an irradiation region in the light receiving portion exit from the light guide and a light receiving region where the light receiving portion can receive light in the conventional light guide.
  • FIG. 23 is a cross-sectional view showing a state in which the light guide is bent.
  • FIG. 24 is a view showing a positional relationship of the irradiation region of the light from the light guide to the light receiving portion and the light receiving region of the light receiving portion in the conventional light guide module.
  • FIG. 2 shows a schematic configuration of a light guide module 1 according to the present embodiment.
  • the light guide module 1 includes a light transmission processing unit 2 , a light reception processing unit 3 , a light guide 4 , and a package 5 .
  • the light transmission processing unit 2 has a configuration including a light emitting drive portion 6 and a light emitting portion (optical element) 7 .
  • the light emitting drive portion 6 drives the light emission of the light emitting portion 7 based on an electrical signal inputted from the outside.
  • the light emitting drive portion 6 is configured by a light emission drive IC (Integrated Circuit).
  • the light emitting drive portion 6 includes an electrical connecting part with respect to an electrical wiring for transmitting the electrical signal from the outside.
  • the light emitting portion 7 emits light based on a drive control by the light emitting drive portion 6 .
  • the light emitting portion 7 is configured by a light emitting element such as VCSEL (Vertical Cavity-Surface Emitting Laser).
  • VCSEL Vertical Cavity-Surface Emitting Laser
  • a light incident side end of the light guide 4 is irradiated with the light emitted from the light emitting portion 7 as a light signal.
  • the light reception processing unit 3 has a configuration including an amplifier 8 and a light receiving portion (optical element) 9 .
  • the light receiving portion 9 receives the light serving as a light signal exit from a light exit side end of the light guide 4 , and outputs an electrical signal through photoelectric conversion.
  • the light receiving portion 9 is configured by a light receiving element such as PD (Photo-Diode).
  • the amplifier 8 amplifies the electric signal outputted from the light receiving portion 9 and outputs the same to the outside.
  • the amplifier 8 is configured by amplification IC, for example.
  • the amplifier 8 includes an electrical connecting part with respect to the electrical wiring for transmitting the electrical signal to the outside.
  • the light guide 4 is a medium for transmitting the light exit from the light emitting portion 7 to the light receiving portion 9 .
  • the details of the configuration of the light guide 4 will be hereinafter described.
  • the package 5 mounts the light transmission processing unit 2 or the light reception processing unit 3 , and the light guide 4 .
  • the electrical wiring 12 (see FIG. 4 ) mounted on the package 5 connects a light emission driving portion 6 and a light emitting portion 7 , and an amplifier 8 and a light receiving portion 9 to transmit the electrical wiring.
  • a flexible print substrate (FPC) a coaxial cable, a lead frame, and the like are used.
  • FIG. 3 schematically shows the state of light transmission in the light guide 4 .
  • the light guide 4 is configured by a column-shaped member having flexibility.
  • a light incident surface 4 A is arranged at the light incident side end of the light guide 4
  • a light exit surface 4 B is arranged at the light exit side end.
  • the light incident surface 4 A and the light exit surface 4 B are arranged while inclined in the light transmission direction in a case where the light is transmitted through the core 10 .
  • the light emitted from the light emitting portion 7 enters the light incident side end of the light guide 4 from a direction perpendicular to the light transmission direction of the light guide 4 .
  • the incident light is advanced through the light guide 4 by being reflected at the light incident surface 4 A.
  • the light advanced through the light guide 4 and reached the light exit side end is reflected at the light exit surface 4 B to be exit in a direction perpendicular to the light transmission direction of the light guide 4 .
  • the exit light is applied to the light receiving portion 9 , and subjected to photoelectric conversion in the light receiving portion 9 .
  • the light emitting portion 7 and the light receiving portion 9 are arranged in the lateral direction in the light transmission direction with respect to the light guide 4 .
  • the light emitting portion 7 and the light receiving portion 9 are installed between the light guide 4 and the substrate surface so as to emit and receive the light in the normal line direction of the substrate surface.
  • This configuration facilitates mounting than the configuration in which the light emitting portion 7 and the light receiving portion 9 are installed so as to emit light parallel to the substrate surface, and can be more miniaturized.
  • the general configuration of the light emitting portion 7 and the light receiving portion 9 has a larger size in the direction perpendicular to the direction of emitting and receiving light than the size in the direction of emitting and receiving light. Furthermore, application can also be made to a configuration using a light emitting element and a light receiving element directed for plane mounting in which the electrode is in the same plane.
  • FIGS. 4 and 5 One example of a light coupling method of the light guide 4 and the light emitting portion 7 and the light guide 4 and the light receiving portion 9 will be described using FIGS. 4 and 5 along with the manufacturing method of the light guide module 1 .
  • the light coupling method of the light guide 4 and the light emitting portion 7 and the light coupling method of the light guide 4 and the light receiving portion 9 respectively have the same configuration, and thus the light coupling method of the light guide 4 and the light emitting portion 7 will be described for the sake of convenience of the explanation.
  • FIG. 1 One example of a light coupling method of the light guide 4 and the light emitting portion 7 and the light guide 4 and the light receiving portion 9 will be described using FIGS. 4 and 5 along with the manufacturing method of the light guide module 1 .
  • the light coupling method of the light guide 4 and the light emitting portion 7 and the light coupling method of the light guide 4 and the light receiving portion 9 respectively have the same configuration, and thus the light coupling method of the light guide 4 and the light emitting portion
  • the extending direction of the light guide 4 is the Z direction
  • the normal line direction with respect to the light emitting surface of the light emitting portion 7 orthogonal to the Z direction is the Y direction
  • the direction perpendicular to the Z-Y plane, that is, lateral width (longitudinal) direction at the end face of the light guide 4 is the X direction.
  • the light emission driving portion 6 and the light emitting portion 7 are mounted on the bottom surface of the package 5 fixed with a jig and the like through a method such as soldering, and the light emission driving portion 6 and the light emitting portion 7 are connected with the electrical wiring 12 .
  • An adhesive is then applied to the surface for mounting the light guide 4 in the package 5 .
  • Various types of commercially available adhesive may be used.
  • the light guide 4 is then handled using an air chuck and the like, and position adjustment of the light guide 4 and the light emitting portion 7 is performed with an image recognition device (not shown) installed on the upper side (Y direction) of the package 5 .
  • the light guide 4 is mounted and adhered to the package 5 at a position a light incident region in the light incident surface 4 A of the light guide 4 and a light emitting region of the light emitting portion 7 coincide in the image of the image recognition device.
  • the light guide 4 and the light emitting portion 7 thus can be light coupled.
  • the coupling loss and the bending loss which are the loss of light that occurs in light transmission of the light guide 4 will be described in detail.
  • the coupling loss is the loss of light that occurs when the light from the light source (correspond to light emitting portion 7 ) enters the light guide 4 .
  • a spacing of a certain extent is formed between the light emitting portion 7 and the light guide 4 . This is to absorb the error in the installation position of the light emitting portion 7 and the light guide 4 and the error in parts size, and to ensure an electrical wiring space when mounting the light emitting portion 7 to the package 5 .
  • the light emitted from the light emitting portion 7 enters the light guide 4 through the spacing.
  • the light emitted from the light emitting portion 7 thus does not completely enter the light guide 4 , whereby loss of light occurs, which is the coupling loss.
  • Similar coupling loss occurs on the light exit side. In other words, the light exit from the light guide 4 is not completely received by the light receiving portion 9 , whereby loss of light occurs, which is the coupling loss.
  • the bending loss is the loss of light that occurs when the light guide 4 is bent. This will be specifically described below.
  • the light transmitted through the light guide 4 is transmitted in the light transmission direction by repeating total reflection in the core 10 .
  • the incident angle with respect to the inner surface of the core 10 needs to be greater than or equal to a predetermined angle to enable the light to be totally reflected. If the light guide 4 is bent, the probability the incident light of the light that hits the inner surface of the core 10 opposite to the bent direction becomes small becomes high. The transmitted light is thus not totally reflected at the inner surface of the core 10 , and some of the light transmits to the outside.
  • the loss of light that occurs here is the bending loss.
  • FIG. 1 show a cross-sectional view and a front view of the light guide 4 in the present embodiment.
  • the light guide 4 has a configuration including a columnar-shaped core 10 having the light transmission direction (Z direction) as the axis, and a clad 11 arranged to surround the periphery of the core 10 .
  • the core 10 and the clad 11 are made of material having translucency, and the index of refraction of the core 10 is higher than the index of refraction of the clad 11 .
  • the optical signal that entered the core 10 is transmitted in the light transmission direction by repeating total reflection inside the core 10 .
  • the material for forming the core 10 and the clad 11 may be glass, plastic, and the like, but resin material of acryl, epoxy, urethane, silicon, and the like is preferably used to configure the light guide 4 having sufficient flexibility.
  • the clad 11 may be made of gas such as air. Furthermore, similar effects can be obtained even if the clad 11 is used under an atmosphere of liquid having a smaller index of refraction than the core 10 .
  • the cross-sectional shape of the core 10 at the plane perpendicular to the light transmission direction is a rectangle.
  • the light incident surface 4 A and the light exit surface 4 B of the core 10 is formed in a stepwise manner in the extending direction (Z direction) of the light guide 4 to have a plurality of inclined surfaces.
  • the end face of the core 10 has the inclined surface, where the orthogonal projection to the plane (X-Y plane) orthogonal to the extending direction (Z direction) of the light guide 4 has a rectangular shape, divided to a plurality of inclined surfaces parallel to the longitudinal direction of the rectangular shape and the plurality of inclined surfaces arranged while shifted in parallel without changing the respective inclined angle so that the inclined surface closer to the light emitting portion 7 is positioned in the direction (Z direction) of moving away from the end face of the light guide 4 so as to extend in the direction (Z direction) of moving away from the end face in a stepwise manner as a whole.
  • the light incident surface 4 A and the light exit surface 4 B include a plurality of inclined surfaces having an angle same as the inclined angle ⁇ of the light incident surface and the light exit surface in the conventional light guide, and are formed in a stepwise manner in the Z direction (direction of moving away from the end face of the light guide 4 ).
  • FIG. 6 is a cross-sectional view showing the light emitting region of the light emitted from the light emitting portion 7 introduced into the core 10 .
  • the extending direction of the light guide 4 is the Z direction
  • the normal direction with respect to the light emitting surface of the light emitting portion 7 orthogonal to the Z direction is the Y direction.
  • the light emitting region of the light emitted from the light emitting portion 7 that can be introduced into the core 10 of the waveguide 4 is determined by the inclined angle of the light incident surface 4 A and the index of refraction of the light guide 4 .
  • the ⁇ 1 and ⁇ 2 described in FIG. 19 showing the configuration of the conventional light guide are angles indicating the range the light emitted from the light emitting portion can be introduced into the core, and respectively represent the angle with respect to the light emission axis in the Y direction in the light emitting portion. In other words, the light emitted in the range of ⁇ 1 and ⁇ 2 is totally reflected at the light incident surface and introduced into the core.
  • the light incident surface 4 A includes a plurality of inclined surfaces having an angle same as the inclined angle ⁇ of the light incident surface in the conventional light guide and is formed in a stepwise manner in the Z direction, as shown in FIG. 6 .
  • the region of the light incident surface 4 A can be made larger than the range ( ⁇ 1 and ⁇ 2 ) of the light that can be introduced into the light guide 4 .
  • the light (light of range of ⁇ 1 in FIG. 6 ), which is outside the irradiation region at the conventional light incident surface, can be reliably reflected at the light incident surface 4 A and introduced into the light guide 4 .
  • the coupling loss i.e., the loss of light that occurs when the light from the light emitting portion 7 enters the light guide 4 can be reduced. Therefore, according to the light guide 4 of the present embodiment, a more stable light transmission can be performed compared to the conventional configuration.
  • a method of increasing the thickness (height in Y direction) of the core 10 is considered to reduce the coupling loss, but is not preferable as this leads to increase in the bending loss. Therefore, the thickness of the core 10 is preferably the same or smaller than the conventional configuration. The coupling loss thus can be reduced without increasing the bending loss.
  • FIG. 7 is a cross-sectional view showing the irradiation region to the light receiving portion 9 of the light exit from the light guide 4 .
  • the inclined surface of the light exit surface has a planar shape in the conventional light guide.
  • the light exit surface (dotted line portion in FIG. 7 ) has a linear shape when the figure is seen from the upper side of the plane of drawing.
  • some of the light exit from the light guide is applied outside the range of the light receiving region 9 a of the light receiving portion due to variation in mounting the light receiving portion, variation in mounting the light guide, and the like, and the light quantity received by the light receiving portion is reduced.
  • the coupling loss i.e., the loss of light that occurs when the light exit from the light guide is received by the light receiving portion.
  • the light exit surface 4 B includes a plurality of inclined surfaces having an angle same as the inclined angle ⁇ of the light exit surface in the conventional light guide and is formed in a stepwise manner in the Z direction, as shown in the figure.
  • the irradiation region to the light receiving portion 9 of the light exit from the light guide 4 can be extended than the conventional configuration.
  • the irradiation region to the light receiving portion 9 of the light exit from the light guide 4 may be greater than the light receiving region 9 a of the light receiving portion 9 .
  • the light quantity received by the light receiving portion 9 can be maintained constant, and thus the fluctuation amount of the coupling loss, i.e., the loss of light that occurs when the light exit from the light guide 4 is received by the light receiving portion 9 can be suppressed. Therefore, according to the light guide 4 of the present embodiment, a more stable light transmission can be performed compared to the conventional configuration.
  • a method of reducing the coupling loss by increasing the thickness (height in Y direction) of the core 10 is not preferable as this leads to increase in the bending loss, as mentioned above. Therefore, the thickness of the core 10 is preferably the same or smaller than the conventional configuration. The coupling loss thus can be reduced without increasing the bending loss.
  • the irradiation region of the light from the light guide 4 can be enlarged without setting the distance from the light guide 4 to the light receiving surface of the light receiving portion 9 long, and thus the light guide module 1 can be more miniaturized and thinned.
  • both the light incident surface 4 A and the light exit surface 4 B of the core 10 are formed in a stepwise manner in the extending direction of the light guide 4 , but either one of the light incident surface 4 A or the light exit surface 4 B may be formed in a stepwise manner in the extending direction of the light guide 4 .
  • an effect in that the coupling loss can be reduced and a stable light transmission can be performed is obtained.
  • the inclined angle ⁇ of the light incident surface 4 A and the light exit surface 4 B of the core 10 is preferably set in a range of between 30 degrees and 60 degrees, and more preferably set to 45 degrees or approximately 45 degrees.
  • FIG. 8 shows a cross-sectional view and a front view of the light guide 4 serving as a first variant.
  • the light incident surface 4 A and the light exit surface 4 B of the core 10 are formed in a stepwise manner in the extending direction (Z direction) of the light guide 4 so as to include a plurality of inclined surfaces, but in the configuration of the first variant, the inclined end faces of the light guide 4 , that is, the end faces of the core 10 and the clad 11 are formed in a stepwise manner in the extending direction (Z direction) of the light guide 4 to include a plurality of inclined surfaces, as shown in FIG. 8 .
  • a protective film 13 may be covered on the clad 11 of the light guide 4 .
  • FIG. 10 shows a front view of the light guide 4 serving as a second variant.
  • the light incident surface 4 A and the light exit surface 4 B of the core 10 are formed in a stepwise manner in the extending direction (Z direction) of the light guide 4 to include a plurality of inclined surfaces in parallel to the width direction (X direction) of the light guide 4 .
  • the surfaces are formed so that the sectionalizing portion of the step (inclined surface) in the extending direction of the light guide 4 , that is, the line at the end face of the core 10 shown in the front view of FIG. 1B is parallel to the X direction.
  • the surfaces are formed so that the sectionalizing portion of the step in the extending direction of the light guide 4 , that is, the line at the end face of the core 10 (or the light guide) shown in FIG. 10 is not parallel to the X direction and has a predetermined angle, as shown in FIG. 10 .
  • the predetermined angle in the X direction is preferably set to a range of ⁇ degrees.
  • FIG. 11 shows a cross-sectional view and a front view of the light guide 4 serving as a third variant.
  • the light incident surface 4 A and the light exit surface 4 B of the core 10 are formed in a stepwise and regular manner in the extending direction (Z direction) of the light guide 4 so as to include a plurality of inclined surfaces.
  • the sectionalizing portion of the step (inclined surface) in the extending direction of the light guide 4 is regularly formed, that is, on a plurality of lines at the end face of the core 10 shown in the front view of FIG. 1 , the distance between the adjacent lines is equal to each other.
  • the sectionalizing portion of the step in the extending direction of the light guide 4 is irregularly formed, that is, on a plurality of lines at the end face of the core 10 (or the light guide 4 ) shown in FIG. 11 , the distance between the adjacent lines is different from each other, as shown in FIG. 11 .
  • the reflection surface of the light can be irregularly formed, whereby interference of light can be suppressed and a more stable light transmission can be carried out.
  • FIG. 12 shows a cross-sectional view of the light guide 4 serving as a fourth variant.
  • the reflection surface (light incident surface 4 A and light exit surface 4 B) of the sectionalizing portion of the step in the extending direction of the light guide 4 that is, the reflection surface formed between the reflection surfaces formed at a predetermined angle (e.g., 45 degrees) is formed to be parallel to the X-Z plane.
  • the reflection surface between the reflection surfaces formed at a predetermined angle e.g., 45 degrees
  • the region of the light incident surface 4 A and the region of the light exit surface 4 B of the core 10 can be enlarged, and the fluctuation amount of the coupling loss can be suppressed.
  • FIG. 13 shows a cross-sectional view of the light guide 4 serving as a fifth variant.
  • a reflection mirror (reflection plate) 14 is arranged on the light incident surface 4 A and the light exit surface 4 B.
  • the reflection mirror 14 is configured by a thin film of a material having high reflectivity such as aluminum, or a wavelength filter for transmitting a specific wavelength. The reflection loss at the light incident surface 4 A and the light exit surface 4 B thus can be reduced, and a more stable light transmission can be performed.
  • FIG. 14 shows a cross-sectional view and a front view of the light guide 4 serving as a sixth variant.
  • the light incident surface 4 A and the light exit surface 4 B at the periphery of the core 10 including the core 10 are formed in a stepwise and irregular manner in the extending direction (Z direction) of the light guide 4 .
  • the distance between the adjacent lines is different from each other.
  • FIG. 15 shows a cross-sectional view and a front view of the light guide 4 serving as a seventh variant.
  • the sectionalizing portion of the step in the extending direction of the light guide 4 that is, the line at the end face of the core 10 shown in the front view of FIG. 1 is formed in plurals in the Y direction.
  • only one sectionalizing portion of the step in the extending direction of the light guide 4 that is, the line at the end face of the core 10 (or the light guide 4 ) shown in the front view of FIG. 15 is formed. According to such configuration as well, the region of the light incident surface 4 A and the region of the light exit surface 4 B of the core can be enlarged compared to the conventional configuration, and thus the coupling loss can be reduced.
  • the light guide 4 of the present embodiment can be applied to the following application examples.
  • a foldable electronic device such as a foldable portable telephone, a foldable PHS (Personal Handyphone System), a foldable PDA (Personal Digital Assistant), and a foldable notebook computer.
  • a foldable electronic device such as a foldable portable telephone, a foldable PHS (Personal Handyphone System), a foldable PDA (Personal Digital Assistant), and a foldable notebook computer.
  • FIGS. 16( a ) to 16 ( c ) show an example in which the light guide 4 is applied to a foldable portable telephone 40 .
  • FIG. 16( a ) is a perspective view showing an outer appearance of the foldable portable telephone 40 incorporating the light guide 4 .
  • FIG. 16( b ) is a block diagram of a portion where the light guide 4 is applied in the foldable portable telephone 40 shown in FIG. 16( a ).
  • a control unit 41 arranged on a body 40 a side in the foldable portable telephone 40 an external memory 42 , a camera (digital camera) 43 , and a display unit (liquid crystal display) 44 arranged on a lid (drive portion) 40 b side rotatably arranged at one end of the body with the hinge portion as a shaft are connected by the light guide 4 .
  • FIG. 16( c ) is a perspective plan view of the hinge portion (portion surrounded with a broken line) in FIG. 16( a ).
  • the light guide 4 is wrapped around a holding rod at the hinge portion and bent to thereby connect the control unit arranged on the body side, and the external memory 42 , the camera 43 , and the display unit 44 arranged on the lid side.
  • High speed and large capacity communication can be realized in a limited space by applying the light guide 4 to the foldable electronic device. Therefore, it is particularly suitable in devices where high speed and large capacity data communication is necessary and miniaturization is demanded such as the foldable liquid crystal display.
  • the light guide 4 is applied to a device having a drive portion such as a printer head in a printing device (electronic device) and a reading unit in a hard disk recording and reproducing device.
  • FIGS. 17( a ) to 17 ( c ) show an example in which the light guide 4 is applied to a printing device 50 .
  • FIG. 17( a ) is a perspective view showing an outer appearance of the printing device 50 .
  • the printing device 50 includes a printer head 51 for performing printing on a paper 52 while moving in a width direction of a paper 52 , where one end of the light guide 4 is connected to the printer head 51 .
  • FIG. 17( b ) is a block diagram of a portion where the light guide 4 is applied in the printing device 50 . As shown in the figure, one end of the light guide 4 is connected to the printer head 51 , and the other end is connected to a body side substrate in the printing device 50 .
  • the body side substrate includes control means etc. for controlling the operation of each unit of the printing device 50 , and the like.
  • FIG. 17( c ) and FIG. 17( d ) are perspective views showing a curved state of the light guide 4 when the printer head 51 is moved (driven) in the printing device 50 .
  • the curved state of the light guide 4 changes by the drive of the printer head 51 and each position of the light guide 4 repeatedly curves.
  • the light guide 4 according to the present embodiment is suited for such drive portion. High speed and large capacity communication using the drive portion can be realized by applying the light guide 4 to such drive portions.
  • FIG. 18 shows an example in which the light guide 4 is applied to a hard disk recording and reproducing device 60 .
  • the hard disk recording and reproducing device 60 includes a disk (hard disk) 61 , a head (read/write head) 62 , a substrate introducing portion 63 , a drive portion (drive motor) 64 , and the light guide 4 .
  • the drive portion 64 drives the head 62 along a radial direction of the disk 61 .
  • the head 62 reads the information recorded on the disk 61 and writes information on the disk 61 .
  • the head 62 is connected to the substrate introducing portion 63 by way of the light guide 4 , and propagates the information read from the disk 61 to the substrate introducing portion 63 as a light signal and receives the light signal of the information to write to the disk 61 propagated from the substrate introducing portion 63 .
  • the light guide according to the present invention has a configuration in which at least one of the light incident surface or the light exit surface of the core is formed in a stepwise manner in the extending direction to include a plurality of inclined surfaces.
  • the region of the light incident surface of the core can be enlarged at the light incident surface, whereby the fluctuation amount of the coupling loss due to variation in mounting the light emitting portion and the light guide can be suppressed. Furthermore, the irradiation region of the light exit from the light guide on the light receiving portion can be enlarged compared to the conventional configuration at the light exit surface. Therefore, a light guide capable of suppressing the fluctuation amount of the loss of light in light transmission and enabling stable light transmission with a simple configuration can be provided.
  • the light guide module according to the present invention has a configuration including the light guide, the light emitting portion for irradiating the light incident surface of the light guide with light, and the light receiving portion for receiving the light exit from the light exit surface of the light guide.
  • a light guide module capable of suppressing the fluctuation amount of the loss of light in light transmission and enabling stable light transmission with a simple configuration can be provided.
  • the light guide and the light guide module according to the present invention is applicable to the light communication path between various types of devices, and is also applicable to a flexible optical wiring serving as an in-device wiring mounted in a small and thin commercial-off-the-shelf device.

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Optical Couplings Of Light Guides (AREA)
  • Optical Integrated Circuits (AREA)
  • Semiconductor Lasers (AREA)
US12/530,793 2007-03-16 2008-03-14 Optical waveguide, optical waveguide module, and electronic apparatus Expired - Fee Related US8457455B2 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2007069622 2007-03-16
JP2007-069622 2007-03-16
PCT/JP2008/054721 WO2008114717A1 (ja) 2007-03-16 2008-03-14 光導波路、光導波路モジュール、および電子機器

Publications (2)

Publication Number Publication Date
US20100135613A1 US20100135613A1 (en) 2010-06-03
US8457455B2 true US8457455B2 (en) 2013-06-04

Family

ID=39765825

Family Applications (1)

Application Number Title Priority Date Filing Date
US12/530,793 Expired - Fee Related US8457455B2 (en) 2007-03-16 2008-03-14 Optical waveguide, optical waveguide module, and electronic apparatus

Country Status (6)

Country Link
US (1) US8457455B2 (de)
EP (1) EP2128672A4 (de)
JP (1) JP5233990B2 (de)
KR (1) KR101109983B1 (de)
CN (1) CN101636674B (de)
WO (1) WO2008114717A1 (de)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8031993B2 (en) * 2009-07-28 2011-10-04 Tyco Electronics Corporation Optical fiber interconnect device
KR101579091B1 (ko) * 2010-01-07 2015-12-22 삼성디스플레이 주식회사 터치 위치 검출 방법, 이를 수행하기 위한 터치 위치 검출 장치 및 터치 위치 검출 장치를 포함하는 표시 장치
JP2013050651A (ja) * 2011-08-31 2013-03-14 Omron Corp 光導波路、光伝送モジュールおよび電子機器
JP5867129B2 (ja) * 2012-02-08 2016-02-24 富士通株式会社 光半導体素子及び光半導体素子の製造方法
US9217836B2 (en) * 2012-10-23 2015-12-22 Kotura, Inc. Edge coupling of optical devices
JP6353196B2 (ja) * 2013-05-15 2018-07-04 株式会社エンプラス 光レセプタクルおよび光モジュール
TWI638947B (zh) * 2017-08-25 2018-10-21 技嘉科技股份有限公司 混合反光及導光機制的發光風扇裝置

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04346301A (ja) 1991-05-24 1992-12-02 Nippon Telegr & Teleph Corp <Ntt> 光合分岐器
JP2000137138A (ja) 1998-11-02 2000-05-16 Canon Inc 分波・合波手段を端部に備えた光ファイバ、及び分波・合波手段を受光面上にに備えた光検出装置
JP2000214351A (ja) 1999-01-21 2000-08-04 Nippon Telegr & Teleph Corp <Ntt> 光モジュ―ル実装構造
JP2000292656A (ja) 1999-04-01 2000-10-20 Sony Corp 光伝送装置および光伝送装置の製造方法
US6334014B1 (en) * 1998-11-02 2001-12-25 Canon Kabushiki Kaisha Optical fiber apparatus provided with demultiplexing/multiplexing unit on fiber's end portion, optical detecting apparatus provided with demultiplexing/multiplexing unit on its light receiving surface, and optical transmission system using the same
JP2003307603A (ja) 2002-02-15 2003-10-31 Omron Corp 光学素子及び当該素子を用いた光学部品
JP2005331535A (ja) 2004-05-18 2005-12-02 Sony Corp 光導波路及びその製造方法、並びに光結合装置及びその製造方法
WO2007026843A1 (ja) 2005-08-31 2007-03-08 Mitsumi Electric Co., Ltd. 導波路装置
US20070140615A1 (en) 2005-12-16 2007-06-21 Omron Corporation Waveguide and optical cable module

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6174424B1 (en) * 1995-11-20 2001-01-16 Cirrex Corp. Couplers for optical fibers
US20050036728A1 (en) * 2003-08-12 2005-02-17 Henning Braunisch Curved surface for improved optical coupling between optoelectronic device and waveguide

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04346301A (ja) 1991-05-24 1992-12-02 Nippon Telegr & Teleph Corp <Ntt> 光合分岐器
JP2000137138A (ja) 1998-11-02 2000-05-16 Canon Inc 分波・合波手段を端部に備えた光ファイバ、及び分波・合波手段を受光面上にに備えた光検出装置
US6334014B1 (en) * 1998-11-02 2001-12-25 Canon Kabushiki Kaisha Optical fiber apparatus provided with demultiplexing/multiplexing unit on fiber's end portion, optical detecting apparatus provided with demultiplexing/multiplexing unit on its light receiving surface, and optical transmission system using the same
JP2000214351A (ja) 1999-01-21 2000-08-04 Nippon Telegr & Teleph Corp <Ntt> 光モジュ―ル実装構造
JP2000292656A (ja) 1999-04-01 2000-10-20 Sony Corp 光伝送装置および光伝送装置の製造方法
JP2003307603A (ja) 2002-02-15 2003-10-31 Omron Corp 光学素子及び当該素子を用いた光学部品
JP2005331535A (ja) 2004-05-18 2005-12-02 Sony Corp 光導波路及びその製造方法、並びに光結合装置及びその製造方法
WO2007026843A1 (ja) 2005-08-31 2007-03-08 Mitsumi Electric Co., Ltd. 導波路装置
US20090257713A1 (en) 2005-08-31 2009-10-15 Youichi Itagaki Waveguide device
US20070140615A1 (en) 2005-12-16 2007-06-21 Omron Corporation Waveguide and optical cable module

Non-Patent Citations (11)

* Cited by examiner, † Cited by third party
Title
espacenet.com Abstract; Publication No. 2000137138 dated May 16, 2000; Canon Inc. (1 page).
espacenet.com Abstract; Publication No. JP2000214351 dated Aug. 4, 2000; Nippon Telegraph and Telephone Corp. (1 page).
espacenet.com Abstract; Publication No. JP2000292656 dated Oct. 20, 2000; Sony Corp. (1 page).
espacenet.com Abstract; Publication No. JP2003307603 dated Oct. 31, 2003; Omron Corp. (1 page).
espacenet.com Abstract; Publication No. JP2005331535 dated Dec. 2, 2005; Sony Corp. (1 page).
espacenet.com Abstract; Publication No. JP4346301 dated Dec. 2, 1992; Nippon Telegraph & Telephone Corp. (1 page).
espacenet.com Abstract; Publication No. WO2007026843 dated Mar. 8, 2007; Mitsumi Electric Co., Ltd. (1 page).
Extended European Search Report for Application No. 08722117.2, mailed on May 7, 2012 (7 pages).
International Search Report w/translation from PCT/JP2008/054721 dated Apr. 8, 2008 (4 pages).
Korean Office Action issued in Korean Application No. 10-2009-7019216 mailed on Mar. 14, 2011, and English translation thereof, 8 pages.
Machine English translation of Japanese Publication No. 2000-137138 published on May 16, 2000, 42 pages.

Also Published As

Publication number Publication date
CN101636674B (zh) 2011-05-11
KR20090111350A (ko) 2009-10-26
CN101636674A (zh) 2010-01-27
EP2128672A1 (de) 2009-12-02
KR101109983B1 (ko) 2012-03-13
JPWO2008114717A1 (ja) 2010-07-01
EP2128672A4 (de) 2012-06-06
US20100135613A1 (en) 2010-06-03
JP5233990B2 (ja) 2013-07-10
WO2008114717A1 (ja) 2008-09-25

Similar Documents

Publication Publication Date Title
US8313252B2 (en) Film light guide package, film light guide module, and electronic device
US7907802B2 (en) Optical transmission module
US8218917B2 (en) Package manufacturing method, package, optical module and die for integral molding
US8457455B2 (en) Optical waveguide, optical waveguide module, and electronic apparatus
JP5309990B2 (ja) 光伝送モジュール、電子機器
US8705908B2 (en) Optical transmission module, method for manufacturing optical transmission module, and electronic device
US8696216B2 (en) Optical module, method of producing optical module, optical transmission module, and electronic apparatus
US20100221016A1 (en) Optical transmission module, electronic device and method of manufacturing the same
US8792755B2 (en) Light transmission path package, light transmission module, electronic device and method for manufacturing light transmission module
US20100303412A1 (en) Optical transmission module and electronic device
US8577189B2 (en) Light guide, light transmission module, electronic device, and manufacturing method of light guide
JP5135804B2 (ja) フィルム光導波路、フィルム光導波路モジュール、および電子機器
JP4965135B2 (ja) 光伝送路、光伝送モジュール、および電子機器
JP2008261956A (ja) 光伝送路、光伝送モジュール、および電子機器

Legal Events

Date Code Title Description
AS Assignment

Owner name: OMRON CORPORATION,JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:TERAKAWA, YUKARI;HOSOKAWA, HAYAMI;REEL/FRAME:023216/0774

Effective date: 20090903

Owner name: OMRON CORPORATION, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:TERAKAWA, YUKARI;HOSOKAWA, HAYAMI;REEL/FRAME:023216/0774

Effective date: 20090903

REMI Maintenance fee reminder mailed
LAPS Lapse for failure to pay maintenance fees
STCH Information on status: patent discontinuation

Free format text: PATENT EXPIRED DUE TO NONPAYMENT OF MAINTENANCE FEES UNDER 37 CFR 1.362

FP Lapsed due to failure to pay maintenance fee

Effective date: 20170604